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\usepackage{../graphics}

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\begin{document}

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\begin{frame}[t]

\frametitle{%

  \begin{tabular}{@ {}c@ {}}

  \\[5mm]

  \huge PEP Scala (4) 

  \end{tabular}}

  \normalsize

  \begin{center}

  \begin{tabular}{ll}

    Email:  & christian.urban at kcl.ac.uk\\

    Office: & N\liningnums{7.07} (North Wing, Bush House)\bigskip\\

    Slides \& Code: & KEATS\\

                    & \onslide<2>{\alert{PDF: A Crash-Course in Scala}}\bigskip\\

    Office Hours: &  Thursdays 12:00 -- 14:00\\

    Additionally: & (for Scala) Tuesdays 10:45 -- 11:45\\ 

  \end{tabular}

  \end{center}

\end{frame}

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\begin{frame}[c]

\frametitle{Hints in CW}

\begin{center}  

\includegraphics[scale=0.4]{../pics/hints.png}

\end{center}

\small

\begin{itemize}

  \item Scala Library, e.g.~\texttt{span} in \\

  \url{https://www.scala-lang.org/api/current/scala/collection/immutable/List.html}

\end{itemize}

\end{frame}

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\begin{frame}[c]

\frametitle{Discussion Forum}

\begin{center}  

\includegraphics[scale=0.38]{/Users/cu/discussion.png}

\end{center}

\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

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\begin{frame}[c]

\frametitle{Preliminary 7}

Raw marks (261 submissions):\bigskip

\begin{itemize}

\item 4\%: \hspace{4mm}236

\item 3\%: \hspace{4mm}10

\item 2\%: \hspace{4mm}1

\item 1\%: \hspace{4mm}0

\item 0\%: \hspace{4mm}15 

\end{itemize}\bigskip\bigskip  

\footnotesize

(plagiarism/collusion interviews ongoing!)

\end{frame}

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\begin{frame}[c,fragile]

\small

\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=1mm]

def is_legal(dim: Int, p: Path, x: Pos) = {

  if (...some_really_long_condition...) false

  else true

}

\end{lstlisting}

\pause

\bigskip

\rule{11cm}{0.3mm}

\bigskip

\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=1mm]

def is_legal(dim: Int, p: Path, x: Pos) = 

  !(...some_really_long_condition...)

\end{lstlisting}

\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 

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\begin{frame}[c,fragile]

\small

\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=1mm]

def foobar(...) = {

  val cs = for (c <- str) yield c.toLowerCase

  ...

}

\end{lstlisting}

\pause

\bigskip

\rule{11cm}{0.3mm}

\bigskip

\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=1mm]

def foobar(...) = {

  val cs = str.map(_.toLowerCase)

  ...

}

\end{lstlisting}

\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 

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\begin{frame}[c,fragile]

\small

\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=-7mm]

def RomanNumeral2Int(rs: RomanNumeral): Int = 

 rs match { 

   case Nil => 0

   case M::r    => 1000 + RomanNumeral2Int(r)  

   case C::M::r => 900 + RomanNumeral2Int(r)

   case D::r    => 500 + RomanNumeral2Int(r)

   case C::D::r => 400 + RomanNumeral2Int(r)

   case C::r    => 100 + RomanNumeral2Int(r)

   case X::C::r => 90 + RomanNumeral2Int(r)

   case L::r    => 50 + RomanNumeral2Int(r)

   case X::L::r => 40 + RomanNumeral2Int(r)

   case X::r    => 10 + RomanNumeral2Int(r)

   case I::X::r => 9 + RomanNumeral2Int(r)

   case V::r    => 5 + RomanNumeral2Int(r)

   case I::V::r => 4 + RomanNumeral2Int(r)

   case I::r    => 1 + RomanNumeral2Int(r)

 }

\end{lstlisting}

\end{frame}

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\begin{frame}[c,fragile]

\frametitle{Last Week: Pattern Matching} 

\small

\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=3mm]

def fizz_buzz(n: Int) : String = 

  (n % 3, n % 5) match {

    case (0, 0) => "fizz buzz"

    case (0, _) => "fizz"

    case (_, 0) => "buzz"

    case _ => n.toString  

  }

\end{lstlisting}

\end{frame}

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\begin{frame}[c,fragile]

\frametitle{Reverse Polish Notation}

{\Large\bl{$(3 + 1) * (2 + 9)$}}\bigskip

{\Large$\Rightarrow$}\bigskip

{\;\;\Large\bl{$3\;\;1\;+\;2\;\;9\;+\;*$}}

\begin{textblock}{3}(11,4)

\begin{onlyenv}<2>

\begin{lstlisting}[language=JVMIS]

ldc 3

ldc 1

iadd

ldc 2

ldc 9

iadd

imul

\end{lstlisting}

\end{onlyenv} 

\end{textblock}

\end{frame}

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\begin{frame}[c,fragile]

\frametitle{Sudoku}

A very simple-minded version on 110 problems:\bigskip

\begin{itemize}

\item 1 core: 800 secs

\item 2 cores: 400 secs

\item 8 cores: 290 secs

\item 18 cores: 142 secs

\end{itemize}

\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{frame}[t]

  \begin{center}  

  \includegraphics[scale=0.3]{../pics/blow.png}

  \end{center}

  \begin{textblock}{14}(2,11.4)

  \large\bf{}Mind-Blowing Regular Expressions:\\ 

  \centering in Python, JavaScript, Java

  \end{textblock}

\end{frame}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{frame}[c,fragile]

\frametitle{Regular Expressions} 

Suppose you have the regular expression 

\only<1-3>{\alert{\texttt{(a*)b}}}%

\only<4->{\alert{\texttt{(a*)*b}}} :\bigskip

\begin{center}

\only<1>{\code{"aaaaaaaaaaaaaaab"}}

\only<2>{\code{"aaaaa...........aaaaaaaaaaaaaaaaaaaab"}}

\only<3>{\code{"aaaaa...........aaaaaaaaaaaaaaaaaaaa"}}

\only<4>{\code{"aaaaa...........aaaaaaaaaaaaaaaaaaaab"}}

\only<5->{\code{"aaaaa...........aaaaaaaaaaaaaaaaaaaa"}}

\end{center}

\only<6>{

\begin{textblock}{13}(5,12)

How long does Python need to find out?

\end{textblock}}

\end{frame}

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\begin{frame}<1>[c]

  \frametitle{CW 9: Regexes}

\begin{center}

  Graphs: \alert{\texttt{(a*)*b}} and strings $\underbrace{\;\texttt{a}\ldots \texttt{a}\;}_{n}$\bigskip

\begin{tabular}[t]{@{\hspace{-8mm}}c@{\hspace{-4mm}}c@{}}

\only<1>{\raisebox{6mm}{\begin{tikzpicture}

\begin{axis}[

    xlabel={$n$},

    x label style={at={(1.05,0.0)}},

    ylabel={time in secs},

    enlargelimits=false,

    xtick={0,5,...,30},

    xmax=33,

    ymax=35,

    ytick={0,5,...,30},

    scaled ticks=false,

    axis lines=left,

    width=5.5cm,

    height=5cm, 

    legend entries={\small{}Python,  \small{}Java 8,  \small{}JavaScript},  

    legend pos=north west,

    legend cell align=left]

\addplot[blue,mark=*, mark options={fill=white}] table {re-python2.data};  

\addplot[cyan,mark=*, mark options={fill=white}] table {re-java.data};

\addplot[red,mark=*, mark options={fill=white}] table {re-js.data};

\end{axis}

\end{tikzpicture}}}%

\only<2>{\raisebox{0mm}{\begin{tikzpicture}

\begin{axis}[

    xlabel={$n$},

    x label style={at={(1.05,0.0)}},

    ylabel={time in secs},

    %y label style={at={(0.06,0.5)}},

    enlargelimits=false,

    %xtick={0,30000,...,60000},

    xmax=65000,

    ymax=35,

    ytick={0,5,...,30},

    scaled ticks=true,

    axis lines=left,

    width=5.5cm,

    height=5cm, 

    legend entries={\small{}Java 9},  

    legend pos=north west]

\addplot[cyan,mark=*, mark options={fill=white}] table {re-java9.data};

\end{axis}

\end{tikzpicture}}}

  &

\onslide<1-2>{\begin{tikzpicture}

  \begin{axis}[

    xlabel={$n$},

    x label style={at={(1.05,0.0)}},

    ylabel={time in secs},

    enlargelimits=false,

    ymax=35,

    ytick={0,5,...,30},

    axis lines=left,

    %%scaled ticks=false,

    width=5.5cm, 

    height=5cm]

%%\addplot[green,mark=square*,mark options={fill=white}] table {re2a.data};    

\addplot[magenta,mark=square*,mark options={fill=white}] table {re3a.data};

\end{axis}

\end{tikzpicture}}

\end{tabular}

\end{center}

\hfill\small\url{https://vimeo.com/112065252}

\end{frame}

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\begin{frame}[c]

\begin{center}

  \includegraphics[angle=90,scale=0.35]{/Users/cu/vote.pdf}

\end{center}

 \only<2>{%

\begin{textblock}{13}(10,10)

\includegraphics[scale=0.2]{/Users/cu/goodvote.png}

\end{textblock}}

\end{frame}

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\begin{frame}[c]

\begin{center}

  \includegraphics[scale=0.25]{/Users/cu/dresden.png}

\end{center}

\begin{textblock}{13}(2,12)

\includegraphics[scale=0.08]{/Users/cu/kiss.jpg}

\end{textblock}

\begin{textblock}{13}(6.8,12)

\includegraphics[scale=0.079]{/Users/cu/pioniere.jpg}

\end{textblock}